Jack-arm.



No. 801,534. PATENTED OCT. 10, 1905.

W. E. MAGIE.

JACK ARM.

APPLICATION FILED FEB.18,1905.

UNITED STATES PATIENT OFFICE \VILLIAM E. MAGIE. OF SOUTH MILWAUKEE,WISCONSIN, ASSIGNOR TO THE BUCYRUS COMPANY, OF SOUTH MILIVAUKEE,WISCONSIN, A

CORPORATION OF WISCONSIN.

JACK-ARM.

Specification of Letters Patent.

Patented Oct. 10, 1905.

To all whom it ntrty concern:

Be it known that I, IVILLIAM E. MAGIE, a citizen of the United States,residing in South Milwaukee, county of Milwaukee, Wisconsin, haveinvented certain new and useful Improvements in Jack-Arms; and I dohereby declare the following to be a full, clear, and exact descriptionof the invent-ion, such as will enable others skilled in the art towhich it appertains to make and use the same.

The invention relates to jack-arms for railway-cars, excavators, and thelike, and has for its object the provision of a jack-arm of simple formand great strength that is capable of being folded back against thecar-body when not in use without disassociating or disconnecting themembers of the jack-arm.

To this end the invention comprises a jackarm having a tension memberand a compression member united at their outerends, a pivot-pinconnecting the divergent ends of said members and yokes or shacklesconnecting the ends of said pivot-pin to the car-body to permit the armto swing horizontally.

a side elevation of theimprovedjack-arm applied to a car, said arm beingin its outer or operative position. Fig. 2 is a plan view of the same.

Referring to the drawings, A indicates the body of a car, such as isusually employed as the support for excavators, wrecking-cranes, and thelike. In order to provide a more stable foundation for such structuresthan the wheels afford, it is customary to provide jackarms consistingof bracket-like structures projecting from the sides of the car-body toextend the area of the car-support. The jackarms as heretoforeconstructed usually con- 40 sisted of a compression member provided witheither a vertical or a horizontal pivotal connection with the car-bodyand a tension member mounted upon a horizontal pivot. This arrangementrendered it necessary to separate the two members before they could bewithdrawn within the permissible lateral overhang of the car withrespect to the right of way. \Vhen thus separated, the compressionmember was swung in eithera horizontal 5 or a vertical plane to bringthe same within the limits of the car-body and the tension member wasinvariably rotated in a vertical plane about its pivotal point in orderto propf, respectively.

erly stow said member out of the way. It is i apparent that such anarrangement necessarily occasioned considerable delay in setting andstowing the several jack-arms, and the separable character of the armsrendered the apparatus liable to disarrangement or rupture. Thesedilliculties, inherent in the old structures, are entirely obviated bythe jackarm forming the basis of the present invention. Each of saidjack-arms consists of a tension member a, a compression member I), and apivot-pin c, the whole comprising a triangular structure, preferablyformed as an integral metal casting. At the outer end of the arm wherethe tension and compression members are united there is provided athreaded socket (Z for the usual jack-screw. The pivot-pin c is providednear each end with annular journals (1 and f, by means of which thejack-arm is secured for rotatory motion in a horizontal direction in theyokes or shackles and l), which latter are secured to suitable brackets7' and (I on the car-body and serve as bearings for said journals 0 andAs thus constructed and applied the jack-arm swings freely on a verticalpivot, so that the whole jack-arm structure may be rotated horizontallyand when not in use may be folded up against the car-body;

To take up any lateral strain that may be imposed upon the severaljack-arms when the latter are supporting the car and its apparatus, eachof said arms is provided with a brace Z pivoted at one end to thecar-body and adapted to be secured to a bracket Z on the outer end ofthe jack-arm by means of a removable pin a, which passes throughregistering holes in the bracket and brace end. \Vhen the jack-arm isnot in use, this brace may be wholly removed by taking out the pins 0and a, or the pin a only may be removed and the brace swung back againstthe body of the car.

WV hat I claim is- 1. A jack-arm for railway-ears, comprising a tensionmember and a compression member united at their outer ends, both of saidmembers having a vertical pivot connection with the car-body, wherebysaid jack-arm swings horizontally and may be folded back against thecar-body.

2. A jack-arm for railway-cars comprising a tension member and acompression member formed as an integral structure, said members gentends of said members, and shackles enhaving a vertical pivot connectionWith the car-bod y.

3. A jack-arm for railway-cars comprising a tension member and acompression member formed as an integral structure, said members havinga vertical pivot connection with the car-body, and a lateral braceremovably connected at one end to the forward end of the jack-arm and tothe car-body at the other.

4. A jack-arm for railway-cars comprising a tension member, acompression member, and a Vertical pivot-pin connecting the divergagingthe ends of said pivot-pin and connecting the jack-arm to the car forswinging movement about a vertical axis, whereby the jack-arm may befolded back against the carbody.

In testimony WhereofI affix my signature in presence of two witnesses.

WILLIAM E. MAGIE.

Witnesses HARRY B. HAYDEN, P. O. Bonn.

